6161655561 has 8 divisors (see below), whose sum is σ = 8215941504. Its totient is φ = 4107570000.

The previous prime is 6161655553. The next prime is 6161655569. The reversal of 6161655561 is 1655561616.

It is an interprime number because it is at equal distance from previous prime (6161655553) and next prime (6161655569).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6161655561 - 2³ = 6161655553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6161655569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50535 + ... + 121971.

It is an arithmetic number, because the mean of its divisors is an integer number (1026992688).

Almost surely, 2^6161655561 is an apocalyptic number.

It is an amenable number.

6161655561 is a deficient number, since it is larger than the sum of its proper divisors (2054285943).

6161655561 is a wasteful number, since it uses less digits than its factorization.

6161655561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100191.

The product of its digits is 162000, while the sum is 42.

The square root of 6161655561 is about 78496.2136730174. The cubic root of 6161655561 is about 1833.2955002184.

The spelling of 6161655561 in words is "six billion, one hundred sixty-one million, six hundred fifty-five thousand, five hundred sixty-one".